image search pulls up pictures not for kids

As with any browser, if you don't have the 'filtering' on, some bad images can be displayed... With pc browser, you can delete temp internet files to remove jpg/gif. My question is, with the wii Opera, are those jpg/gif stored anywhere that my 'pop-up' while the kids are playing or online themselves?
thanks,

nope, just a dad who has 3 kids that can't stop playing this thing... battled getting on the internet with an old intel access point... going to FL next month and wife worried kids will see those images... she wants to drop kick it out the door...